I’m not sure if live Z adjust is available during a pause, since it prompts for a press of the wheel, and holding the wheel is how you get to the live Z adjust.
You could put all your homing and bed leveling portions of the startup into a separate .gcode file, which would do the homing and probing, and end with a G0 X80 Y10 Z0.15. From there, adjust up/down to get your height to Z0.15.
Then in your reduced startup .gcode in the actual file you’re printing, you would make sure there’s no G28 commands, and use G92 X80 Y10 Z0.15 to identify your manually adjusted position as the new position.
With it configured like that, you’d run your homing-leveling.gcode file, manually adjust up/down, then run the object.gcode file.
For all the trouble this has been though, you can get a BLTouch clone for $15, and I can give you the modified firmware I run on my Mini2.